Patents by Inventor Yuanqiao Rao

Yuanqiao Rao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6737226
    Abstract: A process for making polyester film base material comprising more than 65 mol % of 1,4-cyclohexanedimethanol (CHDM) of the total glycol component in the polyester material. The film base is prepared by sequentially carrying out the following steps: (a) casting a molten polyester resin in a machine direction onto a casting surface to form a continuous sheet, (b) drafting the sheet by stretching in the machine direction at a stretch ratio of from 2 to 4, and at a temperature ranging from 70° C. to 130° C., (c) tentering the sheet in the transverse direction by stretching at a stretch ratio of from 2 to 4, and at a temperature ranging from 70° C. to 130° C. to obtain a biaxially oriented film, (d) heat-setting the oriented film at an actual temperature of from 160° C. to 200° C., and (e) cooling the heat-set film without substantial detentering to obtain a biaxially oriented, heat-set polyester-based film having a cutting index of 1 to 1.
    Type: Grant
    Filed: October 24, 2002
    Date of Patent: May 18, 2004
    Assignee: Eastman Kodak Company
    Inventors: Yuanqiao Rao, Jehuda Greener, Michael R. Brickey
  • Publication number: 20040081928
    Abstract: A process for making polyester film base material comprising more than 65 mol % of 1,4-cyclohexanedimethanol (CHDM) of the total glycol component in the polyester material. The film base is prepared by sequentially carrying out the following steps: (a) casting a molten polyester resin in a machine direction onto a casting surface to form a continuous sheet, (b) drafting the sheet by stretching in the machine direction at a stretch ratio of from 2 to 4, and at a temperature ranging from 70° C. to 130° C., (c) tentering the sheet in the transverse direction by stretching at a stretch ratio of from 2 to 4, and at a temperature ranging from 70° C. to 130° C. to obtain a biaxially oriented film, (d) heat-setting the oriented film at an actual temperature of from 160° C. to 200° C., and (e) cooling the heat-set film without substantial detentering to obtain a biaxially oriented, heat-set polyester-based film having a cutting index of 1 to 1.
    Type: Application
    Filed: October 24, 2002
    Publication date: April 29, 2004
    Applicant: Eastman Kodak Company
    Inventors: Yuanqiao Rao, Jehuda Greener, Michael R. Brickey
  • Patent number: 6727052
    Abstract: This invention relates to a PET-based photographic multilayer film base having improved properties with regard to cutting, stiffness and post-process curl. In particular, the polyester film base comprises a biaxially-stretched multilayer film structure, in which layers a specified amount of monomeric units derived from 1,4-cyclohexanedimethanol (CHDM), sulfonic-acid-substituted aromatic dicarboxylic acid and poly(alkylene glycol) is present.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: April 27, 2004
    Assignee: Eastman Kodak Company
    Inventors: YuanQiao Rao, Jehuda Greener, Robert H. Fehnel, Michael R. Brickey
  • Publication number: 20040063819
    Abstract: A composition suitable for forming a primer layer on a polymer sheet comprising: a) polyethyleneimine; b) latex; wherein the latex has a Tg lower than 25° C. and c) a hydrophilic colloid material. A method of coating the composition is also disclosed.
    Type: Application
    Filed: September 27, 2002
    Publication date: April 1, 2004
    Applicant: Eastman Kodak Company
    Inventors: Yuanqiao Rao, DeBasis Majumdar, Robert J. Kress, David E. Decker
  • Publication number: 20040063023
    Abstract: An imaging member comprising a polymer sheet, a primer layer contacting said polymer sheet, and an image receiving layer contacting said primer layer; wherein said primer layer comprises: a) polyethyleneimine; and b) latex; wherein the latex has a Tg lower than 25° C. and c) hydrophilic colloid material.
    Type: Application
    Filed: September 27, 2002
    Publication date: April 1, 2004
    Applicant: Eastman Kodak Company
    Inventors: Yuanqiao Rao, DeBasis Majumdar, Robert J. Kress, David E. Decker
  • Publication number: 20040041891
    Abstract: An ink jet printing process for improving the durability and image quality of an ink jet image having the steps of a) providing an ink jet recording element having a support having thereon an image-receiving layer containing an ink jet image; and b) applying over the surface of the image-receiving layer an overcoat layer of water-dispersible, smectite clay particles.
    Type: Application
    Filed: August 27, 2002
    Publication date: March 4, 2004
    Applicant: Eastman Kodak Company
    Inventors: Yuanqiao Rao, Robert J. Kress, Lawrence P. Demejo, Sandra D. Nesbitt
  • Patent number: 6670110
    Abstract: This invention relates to a poly(ethylene terephthalate) photographic multilayer film base having improved properties with regard to cutting, stiffness and curl property. The multilayer film base comprises a multilayer structure, in which a tie layer comprises a PET-based polyester material having a specified amount of monomeric units derived from 1,4-cyclohexanedimethanol (CHDM), such that the support layers of the multilayer film base does not delaminate. This PET-based polyester material can be obtained either by the addition/blending of polyester polymers containing CHDM monomeric units to PET material and/or the incorporation of CHDM monomer units into a PET-polymer backbone at appropriate levels.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: December 30, 2003
    Assignee: Eastman Kodak Company
    Inventors: Dennis J. Massa, Michael R. Brickey, Jose R. Garcia, Thomas M. Laney, YuanQiao Rao
  • Patent number: 6667148
    Abstract: Thermally developable materials include an imaging layer containing a non-photosensitive source of reducible silver ions. Disposed over the imaging layer is a barrier layer that comprises inorganic filler particles that are intercalated or exfoliated with a hydrophilic or water-dispersible polymer. The particles have a length to thickness ratio of from about 10 to about 1000. The barrier layer can prevent migration of diffusible imaging components and by-products resulting from high temperature imaging and/or development. These thermally developable materials include both thermographic and photothermographic materials.
    Type: Grant
    Filed: January 14, 2003
    Date of Patent: December 23, 2003
    Assignee: Eastman Kodak Company
    Inventors: YuanQiao Rao, Jon A. Hammerschmidt, Charles L. Bauer, Robert J. Kress, Anne M. Miller
  • Publication number: 20030152760
    Abstract: The invention relates to an imaging member comprising an imaging layer and a base wherein said base comprises a closed cell foam core sheet and adhered thereto an upper and lower flange sheet, wherein said foam core sheet has a modulus of between 100 and 2758 MPa and a tensile toughness between 0.344 and 35 MPa, and wherein said upper and lower flange sheet has a modulus of between and 1380 and 20000 MPa and a toughness between 1.4 and 210 MPa.
    Type: Application
    Filed: September 30, 2002
    Publication date: August 14, 2003
    Applicant: Eastman Kodak Company
    Inventors: Yeh-Hung Lai, Suresh Sunderrajan, Thaddeus S. Gula, William A. Mruk, Narasimharao Dontula, Gary D. Smith, YuanQiao Rao
  • Publication number: 20030129376
    Abstract: The invention relates to an imaging member comprising an imaging layer and a base wherein said base comprises a closed cell foam core sheet and adhered thereto an upper and lower flange sheet, wherein said foam core sheet has a modulus of between 100 and 2758 MPa and a tensile toughness between 0.344 and 35 MPa, and wherein said upper and lower flange sheet has a modulus of between and 1380 and 20000 MPa and a toughness between 1.4 and 210 MPa.
    Type: Application
    Filed: December 28, 2001
    Publication date: July 10, 2003
    Inventors: Yeh-Hung Lai, Suresh Sunderrajan, Thaddeus S. Gula, William A. Mruk, Narasimharao Dontula, Gary D. Smith, YuanQiao Rao
  • Patent number: 6558884
    Abstract: This invention relates to a poly(ethylene terephthalate)-based photographic film base having improved properties with regard to cutting, perforating, and other finishing or phototofinishing operations. The film base comprises a material in which a specified amount of monomeric units derived from 1,4-cyclohexane dimethanol (CHDM), such that the film base has a specified cutting-related property. The level of CHDM in the PET-based polyester material can be adjusted either by physical blending of polyesters containing CHDM monomeric units or by synthetic incorporation of CHDM monomer units into a PET-based polyester backbone.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: May 6, 2003
    Assignee: Eastman Kodak Company
    Inventors: Jehuda Greener, Yuanqiao Rao, Dennis J. Massa, Yeh-Hung Lai
  • Patent number: 6555303
    Abstract: This invention relates to a poly(ethylene terephthalate)-based photographic film base having improved properties with regard to slitting, perforating, and other finishing or cutting operations. The film base comprises a polyester material in which a specified amount of monomer units derived from 1,4-cyclohexane dimethanol (CHDM), such that the film base has a specified cutting-related property. The level of CHDM can be adjusted in the PET-based polyester material either by physical blending of polyesters containing CHDM monomer units or by synthetic incorporation of CHDM monomer units into a PET-based polyester backbone.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: April 29, 2003
    Assignee: Eastman Kodak Company
    Inventors: Yuanqiao Rao, Jehuda Greener, Yeh-Hung Lai
  • Patent number: 6514660
    Abstract: The invention relates to an imaging member comprising a polymer sheet, a primer layer comprising polyethyleneimine and gelatin contacting said polymer sheet, and an image receiving layer contacting said primer layer.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: February 4, 2003
    Assignee: Eastman Kodak Company
    Inventors: Debasis Majumdar, Peter T. Aylward, Robert P. Bourdelais, YuanQiao Rao